There really don't seem to be many Reformed churches in the Salt Lake City area. Besides the two Kyle has already mentioned, I'd look at the Evangelical Free Church there (some of those can be fairly Reformed):

http://www.slcevfree.org/church/

and this one, Roy Bible Church, in Ogden, is listed on the "Founders" website so it may be a Reformed Baptist church:

http://www.roybiblechurch.com/frame.html

Theo